putting this in a frame, is not a good idea,...mounting it on a back board would be much better...cos by the look of the plaster edge, it is misshapen and not square,..as for being handcarved...i very much doubt it....its more likely to have been cast....to mount this on a back board is relatively simple....if you allow say 4in all round...you can frame a backboard with picture frame moulding..then mount this plaster on the backboard,