cylinder was a greenish gold, walnut grips without madallions, sn 21177
If it was 201177 then it should be a tri-color with silver frame, flat loading gate, and that greenish gold cylinder would be correct.
If it was 21177x then it should have a steel cylinder and black frame.
The lightweights all have 6 digits in the SN. Just 21177 would be a standard flatgate with steel frame and 5.5" barrel.
If the alloy cylinder is in good shape, it would be worth over $100 by itself (I seem to recall seeing one sell for close to $200 not long ago).
The grips sound wrong, they should have medallions and most likely be the black checkered plastic type. But there may very well be over $250 worth of parts in it if the grip frame is nice and it still has original lockwork.