This whole subject (date LB changed over to parkerizing from blueing) was launched after someone regurgitated a book (Stratton No4 & No5s) which contains the obvious error (LB started parkerizing in 1943-44) caused by too small a sample & the practice of unmarked Canadian FTRs.
I certainly never said that this survey COULD be DEFINATIVE, though it certainly CAN be REPRESENTATIVE.
Books are sometimes even corrected during their second printings (if I had a dime for everyone who has told me that they wrote a letter to "Cartridges of the World"...). The best explanation I've seen for books is that as soon as they are printed it leads to people actually looking into their basements for their "evidence" which they recall as disproving the printed "facts".
I'm sorry, but IMHO guns which you (or I) owned several years ago actually cannot be taken as evidence of anything. My memory is not perfect, and neither is yours.
My own understanding has grown so much in the last few years that what I saw & miss-understood or forgot about things I own or owned previously cannot be counted on today.
10 years ago I also thought that my 1950 LB was blued, then tefloned, then realized it was parkerized after I had something to compare it to.
For this "survey" I personally examined (within 3 days of each other, not several years ago):
CDN FTR parked LB 1942 MP
CDN FTR parked LB 1942 MP DCRA
CDN FTR parked LB 1943
CDN FTR parked Savage 43/44 serial
84L brit FTR matt blued? 1945
90L8 blued 1945 NIB CES
90Lx blued 1945
91L0 blued 1949
91L250x blued 1949
92L0 Blued
94L0 Parked
94L3 parked
94L9 parked
95L4 parked in cosmo (from original shipping crate)
95L8 parked