Does this signify anything important?

[Steve H. in N.Y.]

A small paper label glued to the barrel flat. It's a No.4 Mk. 1/2, '57 FTR.

Information

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[limpetmine]

1954 Barrel.
1957 was the last year of the FTR program, was it not?
No idea on the significance of the paper.

[Edward Horton]

From the location of the "0" on the paper your barrel is a quarter bubble off from being totally level.
WAG or Wild A$$ guess And you were expecting a level headed answer.



Don't worry about it, the barrel is not that far off.

[jmoore]

Inspector "O"? But why a "temporary" label? Vellllly intellestingk, but...

[Brit plumber]

Its a mobile phone sim card.

[Lance]

My '57 FTR has a paper tag too, but a #1!

[Edward Horton]

Now I'm really wondering if this has anything to do with proof testing which was done while the barrel was in the white and the bolt head number to be fitted during final assembly after the rifle was blued.