Yesterday, a Model 99 sold on GB. It was advertised as an RT. Here is a link to the listing:
https://www.gunbroker.com/item/999144556 It's definitely not what we know as an RT.
Based on the serial number and the "C" LBC (photo #25) and the fact that the receiver is not D&T, this is clearly a 1951 Chicopee Falls receiver of the type used for the EG. It's hard for me to tell, but the buttplate (photo #32) looks more like an EG buttplate vs. the wider R buttplate. Is the forearm (photo #12) a 1950s R forearm? And finally, by 1951 I would have thought that any leftover Utica barrels would have been used up, especially 22 inch barrels in .300 Sav. But, we are talking Savage here.
I asked the seller if the assembly codes matched, but I received no response.
Whatever one wants to call it, it is a neat little rifle.