I would say that the original model would be either a replica or the actual studio prop used from Stargate. Thanks for ur kind words & yea ive noticed it is hard to keep everything straight but ill let u in on a little secret my model isnt 100% dead straight it is just slightly skewed but u can barely notice so im happy with it seeing as im a first time pepper
Oh BackBONE just did some searching on Google & found this pic
so im kinda guessing that the "collar" could be a universal item for every Jaffa helmet
Cheers