Longbranch No.4 Mk1 (no star) Question

[limpetmine]

A 1 L46xx is still a No. 4 Mk 1 (no star). Very very close to the change over at 1L5979.
I would still expect this rifle to have the button knob, grooved upper HG and a Type 1 or 2 back sight.
How does the serial number on the bolt look? Does the bolt font match the receiver heel serial number?
Has the bolt been ground?
Does the rifle "look" right, with grunge in the right places, or does it look immaculately clean.
Post some pictures; they'd help.
-limpetmine