The design consists of the features of shape, configuration, pattern and ornamentation of the two sided crown moulding as shown in the drawings. The drawings show sixteen variants. Figure 1 and 2 show the first variant, Figure 3 and 4 show the second variant, Figure 5 and 6 show the third variant, Figure 7 and 8 show the fourth variant, Figure 9 and 10 show the fifth variant, Figure 11 and 12 shows the sixth variant, Figure 13 and 14 show the seventh variant, Figure 15 and 16 shows the eighth variant, Figure 17 and 18 shows the ninth variant, Figure 19 and 20 show the tenth variant, Figure 21 and 22 show the eleventh variant, Figure 23 and 24 show the twelfth variant, Figure 25 and 26 show the thirteenth variant, Figure 27 and 28 show the fourteenth variant, Figure 29 and 30 show the fifteenth variant and Figure 31 and 32 show the sixteenth variant.Figure 1 is an end elevation view of a two sided crown moulding of constant cross section throughout its length having a variant of the design applied.Figure 2 is a front side perspective view of the two sided crown moulding of Figure 1 broken to indicate indeterminate length. The back side view is the same as the front view rotated 180º.Figure 3 is an end elevation view of a two sided crown moulding of constant cross section throughout its length having a variant of the design applied.Figure 4 is a front side perspective view of the two sided crown moulding of Figure 3 broken to indicate indeterminate length. The back side view is the same as the front view rotated 180º.Figure 5 is an end elevation view of a two sided crown moulding of constant cross section throughout its length having a variant of the design applied.Figure 6 is a front side perspective view of the two sided crown moulding of Figure 5 broken to indicate indeterminate length. The back side view is the same as the front view rotated 180º.Figure 7 is an end elevation view of a two sided crown moulding of constant cross section throughout its length having a variant of the design applied.Figure 8 is a front side perspective view of the two sided crown moulding of Figure 7 broken to indicate indeterminate length. The back side view is the same as the front view rotated 180º.Figure 9 is an end elevation view of a two sided crown moulding of constant cross section throughout its length having a variant of the design applied.Figure 10 is a front side perspective view of the two sided crown moulding of Figure 9 broken to indicate indeterminate length. The back side view is the same as the front view rotated 180º.Figure 11 is an end elevation view of a two sided crown moulding of constant cross section throughout its length having a variant of the design applied.Figure 12 is a front side perspective view of the two sided crown moulding of Figure 11 broken to indicate indeterminate length. The back side view is the same as the front view rotated 180º.Figure 13 is an end elevation view of a two sided crown moulding of constant cross section throughout its length having a variant of the design applied.Figure 14 is a front side perspective view of the two sided crown moulding of Figure 13 broken to indicate indeterminate length. The back side view is the same as the front view rotated 180º.Figure 15 is an end elevation view of a two sided crown moulding of constant cross section throughout its length having a variant of the design applied.Figure 16 is a front side perspective view of the two sided crown moulding of Figure 15 broken to indicate indeterminate length. The back side view is the same as the front view rotated 180º.Figure 17 is an end elevation view of a two sided crown moulding of constant cross section throughout its length having a variant of the design applied.Figure 18 is a front side perspective view of the two sided crown moulding of Figure 17 broken to indicate indeterminate length. The back side view is the same as the front view rotated 180º.Figure 19 is an end elevation view of a two sided crown moulding of constant cross section throughout its length having a variant of the design applied.Figure 20 is a front side perspective view of the two sided crown moulding of Figure 19 broken to indicate indeterminate length. The back side view is the same as the front view rotated 180º.Figure 21 is an end elevation view of a two sided crown moulding of constant cross section throughout its length having a variant of the design applied.Figure 22 is a front side perspective view of the two sided crown moulding of Figure 21 broken to indicate indeterminate length. The back side view is the same as the front view rotated 180º.Figure 23 is an end elevation view of a two sided crown moulding of constant cross section throughout its length having a variant of the design applied.Figure 24 is a front side perspective view of the two sided crown moulding of Figure 23 broken to indicate indeterminate length. The back side view is the same as the front view rotated 180º.Figure 25 is an end elevation view of a two sided crown moulding of constant cross section throughout its length having a variant of the design applied.Figure 26 is a front side perspective view of the two sided crown moulding of Figure 25 broken to indicate indeterminate length. The back side view is the same as the front view rotated 180º.Figure 27 is a an end elevation view of a two sided crown moulding of constant cross section throughout its length having a variant of the design applied.Figure 28 is a front side perspective view of the two sided crown moulding of Figure 27 broken to indicate indeterminate length. The back side view is the same as the front view rotated 180º.Figure 29 is an end elevation view of a two sided crown moulding of constant cross section throughout its length having a variant of the design applied.Figure 30 is a front side perspective view of the two sided crown moulding of Figure 29 broken to indicate indeterminate length. The back side view is the same as the front view rotated 180º.Figure 31 is an end elevation view of a two sided crown moulding of constant cross section throughout its length having a variant of the design applied.Figure 32 is a front side perspective view of the two sided crown moulding of Figure 31 broken to indicate indeterminate length. The back side view is the same as the front view rotated 180º.