Re: Help identify and value my 1990 Universe!
Absolutely, headstock seemed happy to do this, certainly when they first took over the franchise in the mid 90s, although of late I’ve seen less and less of these as if Ibanez itself/Hoshino Gakki has got wind and views it less than favourably... FCN seemed to do it whenever they had too many spare parts and it was never unusual to see the “cool” Ibanez dealers have spare bits (even JEM necks) just hanging around.
That said, making these sorts of things regardless of thendistributer seems to be a UK tradition, along with putting milk in tea and the inability to make a decent cup of coffee.
As I understand it the mongrels were always built from what was around and special orders weren’t either possible or at least were not the norm. What you usually see would be a neck upgrade, or a body swap, so RG550s with JEM necks, certainly in the late 80s and early 90s were if not a regular thing were certainly no real rarity.