I think it is 1873
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Tom, prompted by this subject I've managed to find an old picture of a Diamond which has two auxiliary locks, the lower one which I don't understand as there doesn't appear to be a corresponding second lock.
Attachment 20222
Huw, I am not entirely certain but I always believed that the lower handle operated the keyhole blocking device/s. The attached boltwork picture seems to support this but then my theory falls apart when I see pictures of the safe with keys in the locks but the lower handle vertical unless the shutter has been removed at some time.
Although this picture is of the Diamond boltwork I would think it most probable that the CB was more or less identical.
Attachment 20223 Attachment 20224 I can't remember whether I've mentioned it before but the CB had a heavy steel rim of ½" or thicker welded round the entire front face of the body to help support the extra heavy SRD type hinge assembly and door plus there were oilers originally fixed to the top one with only the attachment holes remaining.
Also, apologies to you Gary for having changed the subject - I must have gone off 'pisste'.
Everyone can go off pisste as much as they want as long as they are posting pictures and info of these beauties.
S51497 style treasury standard quality safe (new design)
S52570 the record that I believe contain this serial number has been cropped upon producing the file, so have counted back and it looks to be a similar description to above
date of 1929 on the index but possibly 1933 on the fiche line
if I find anything else I will post it up.
the best round letterlock is the control for the slider which blocks off the keyhole.
On a fan lock the lower handle lifts/lowers a pivoted actuator (on left and right of the lock) to move two separate bolt works. A different lock could use 2 handles to do that.
a cross shaped rather than t shaped plate would typically be a round ketterlock above a fanlock.
Thanks for that Tom, I never thought of a day lock which I've only seen once before and that was on a huge Milner in the City Collector's Dept. of the Glasgow Corporation. It was a spring latch which I assumed to be an emergency closure device against hold-up.
I'll guess that the top left handle is a pull handle and top right the keyhole shutter knob with the cross-locking bars round handle below.