Thanks. I found a P-51D ARF, but with totally different paint scheme (better actually). And where the fuse meets the wing, there seems to be an extra bit of shape-detail. But scale specs are the same and engine spec is:

Engine: .40-.53 two cycle, .52-.70 four cycle

It has fiberglass engine cowling just like mine.

Ah but just noticed that the wings join together first and then mount to fuse... totally different from mine: wings join each other and fuse with one long aluminum tube through fuse (and bolts to fuse sides).

Well, I guess I can weigh it and go from there unless I find some archival listing of this apparently discontinued version.

Thanks a lot for the help

edit: There's no mention of P-51 in superseded nor discontinued models... a mystery.