Hi-Power Tangent, Slotted, "T" Series

[sdmark777]

For discussion, I bring you a Browning marked slide, FN Belgian made, 9mm Hi-Power with Tangent rear sight, slotted frame for stock, of the "T" series. This Hi-power is Brand New (Never fired outside the factory) in the original pouch, with 100% mint blue. It has a military style serialization, ie vertical serial numbers on the barrel, slide and frame and has black synthetic grips. It has a shipping date of 1975 as per the Browning Historical Letter. Browning's serial dating Website page shows the change from "T" serialization in 1970 when the product code for sporting guns changed to "C", with the ending serial range of T261000 for 1969. Some document "T" serialization continuing to 1972 on some Hi-Powers. I submit this example in the T361000 range shows "T" serialization through 1975 on some Hi-Powers. The pouch tag has the matching serial number and M/S which I believe stands for Military Sights (Browning's designation for Tangent rear sight, see comments on Historical letter). I had never seen or heard of another T series Tangent Slotted Hi-Power until today. There are two on Gunbroker, both with their holster stocks. One is a 1969 T series www.gunbroker.com/item/775705779 and the other is less described ww.gunbroker.com/item/771572897. The Gunbroker ones are very nice, but used and not mine by the way. Rare Hi-Powers indeed or?. Thoughts? Info on these Hi-Powers appreciated. Mark