[R-390] R-390A build dates & serial numbers

[Kim Briggs Echo Resources]

Hi list. 
Thanks for the bandwidth & the constant flow of R-390 info. I have an R-390A here in VK7 that is labelled as a Collins Radio built R-390A. The front panel ID shows it as serial number 4478 & is dated 1970. 

The ID plate is not as per the metal ones as seen on the earlier radios. It is an engraved plastic laminated plate about 73mm long & 36mm high. The second layer is white, so that when the characters are engraved, the black top layer is cut through exposing the white layer below.
 
I have had a look at the various R-390A sites & don't see any mention of Collins produced radios from the 70's. Has anyone seen this type of  ID plate before?

The rear panel has a Collins WE logo stamped in red that appears to be part of the check process from the original build.

I have quite a few Collins radios, but this is my only R-390A. It is complete, but has had some minor mods & some extra holes drilled in the rear panel. Otherwise it looks good, is very clean & has a great front panel with original meters. 

Regards,
Kim Briggs VK7ZZB