Someone else who knows for sure can confirm, but from what I understand the Optima Mid Custom Special came with either the alloy chassis or the FRP chassis, they switched as a running change, not sure which one came first.
Similar situation to the Ultima Pro, they show it with an alloy chassis in the catalog and then when ever I see one for sale it has an FRP chassis
Are you going to use that chassis, I don't think its all that common and yours looks to be mint
The fact it has all the cutouts in the front half like the other factory Kyosho LWB chassis is a very strong indication its not an aftermarket chassis.
The other possibility is it came from the LWB Conversion kit that Kyosho used to sell
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