Chris Dawe has gun now if he still owns it maybe he'll post some pics

And did it document as original?

Never bothered with a letter

Then I would suspect the originality of it. But that is just me.

Parker Bros. single selective trigger was in the right trigger slot with the fore & aft sliding selector in the left trigger slot. The Hunter Arms Co. HOT and the A.H. Fox Gun Co. Fox-Kautzky single selective trigger were in the left barrel slot with the fore & aft sliding selector in the right trigger slot.

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So, a Parker Bros. SST replaced with double triggers would have the R and L on the left side of the triggers while on a Fox they are on the right.

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During the early years of the NID, Ithaca Gun Co. used a Miller single selective trigger with the selector by movement of the safety slide fore or aft --

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The only selector I could ever use when a bird is taking wing. The Howland Single Selective Trigger used by Ithaca in the later NID years externally looked the same. The Howland single non-selective trigger was in the left slot with a blank (?) in the right slot that lifts when the trigger is pulled.

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After getting a letter on the gun, I know that the gun was ordered as a single trigger. But, must have been sent back to be converted to double triggers. ( there no record of this) Thanks for the input. It helps me learn more about Parkers.