**Note: I'm cross posting this at "milsurps.com"**
If you have a 1950 dated Long Branch, I need some information please:
1. what are the first 3 digets of the serial #? eg.) 91L6
2. Is the action blued or parkerized?
3. what is the barrel date? ( 2 digets found on the knox-form) eg.) '50
4. is the barrel parkerized or blued?
5. is the bolt parkerized or blued?
6. is the striker parkerized or blued?
Thank You for your help.
I'm trying to pin down when LB switched to parkerizing from bluing.
I've been telling people for years that they switched early in 1950, but have come across info indicating a later date of change-over.
Unfortunately my sample is quite small, so I'm appealing to everyone for info.
*91L250x, 1949 all blued*
*91L6, blued, 49, blued, blued, blued*
BA57*** (renumbered but) blued, barrel 50, blued, blued, blued
91L7, ?????
91L8, blued, 50, blued, blued, blued
92L0, blued, '50, blued, blued, blued (2x)
93L0, Blued, ?, ?, ?, ?
93L1, parked, ?, ?, ?, ?
93L4, blued, '50, blued, blued, blued (x2)
93L6, parked, ?, parked, parked, blued
93Lx, Blued, ?, ?, ?, ?
94L0, parked, ?, parked, parked, blued
94L0, parked, ?, parked, parked, parked
94L0, park, 50, park, park, park
94L3, parked, '50, parked, blued, parked
94L5, receiver blued, 50, barrel Parked, bolt blued, striker blued
94L8, parked, '51, parked, blued, blued
94L9, parked, '51, parked, parked, parked
95L1, parked, ?, parked, parked, parked
95L4, parked, ?, parked, parked, parked (1 of 10 consecutive from sealed case)
95L4, parked, ?, ?, ?, ?
95L8, parked, ?, parked, parked, parked
95L8, parked, 50, parked, parked, parked
95L9, parked, '51, parked, parked, parked
If you don't want to post openly, you could PM me.

Thanks to everyone who's helped
added info to message 25