Cavalry Sports J -Anybody know its backstory?

[Celtic505]

I was going through the helmet database the other day and came across a very unique helmet I have never seen before, it is a Roman Cavalry sports J helmet and it is very interesting. It looks to be a cross between the Theilenhofen and Phyrgian helmets with the lobated brow and protruding eagles head at the top. It actually has embossed scales on the skull of the helmet if you look closely and has an aventail made up of scales. It honestly reminds me much of one of the helmets depicted on the Ludovisi Sarcophagus which I originally took to be artistic liscence by the sculptor. But if you examine the specific figure I am talking about the helmets while not exact side by side duplicates they do look to be the same helmet. The Ludovisi figure I refer to is the second one from the left and he appears to be grabbing a barbarian by his beard. His helmet looks to be a psuedo-Attic type, it has the attic brow plate but that is where similarities to the Attic helm end. The skull of the helmet is either covered by or embossed with scales and in lieu of a crest it has an eagles head protruding outwards from the top of the skull. It seems obvious that rather than artistic liscence the artist mustve seen and been familiar with the helmet and the military in general. If that figure which from first glance appears so fanciful is actually real then perhaps other aspects may be as well? There appears to be several Etrusco-Corinthian helms shown as well as a parazonium/gladius with a vertical facing lions head for the pommel and multiple musculatas with scales on them, I once thought them to be lorica squamata just sculpted by the artist to take on musculata characteristics but now I think like the Cavalry sports J helm they are actually embossed onto a genuine lorica musculata. Anyways, whilst digging for info on the cav sports J helm I found nothing. No details on where it was found, when it was dated to, its construction, etc. I assume it must be contemporary to the Thielenhofen and cavalry sports I helmets, as it appears to have the same lobated attic brow plate. If anybody else knows any details of this helmet I'd be grateful to hear. Any opinions or thoughts on it too would be welcome, I find it to be a simply fascinating helmet. More and more I am suprised by the archeological record of our knowledge of the Romans and how artistic and elaborate they could be at times. I often like to think about all that is out there or was out there at some point that we have yet to find and/or will never know...BTW here is a link to the above mentioned helmet:

Cavalry Sports J Helmet