I've wanted to know the years in connection to the generations for a long time.
Square Crupi
1st gen: pins, no cross holes, straight legs
2nd gen: pins, cross holes, straight legs
3rd gen: pins, cross holes, curved rear body legs
4th gen: no pins, cross holes, curved legs
Round Crupi
1st gen: script sticker, pinned
2nd gen: script engraved, pinned
3rd gen: font engraved, ppinned
4th gen: font engraved, no pins
5th gen: unpainted logo, font engraved, no pins
Again this is the knowledge I've retained on these... if something incorrect please let me know. Ross I hope this helps out some, hopefully someone will help out with the years.