I hope he accepts it as these are becoming hard to find. Looking at the documentation online it would appear your s/n falls into the SAS range. My own ends in 894 which makes it a MI6 set.
How accurate the source is I'm not sure but the s/n's run as follows:
first 300 sets to Diplomatic Wireless Service
next 200 sets to SAS
last 485 sets to MI6
Having all the bits is a bonus.
Last edited by Bruce MacMillan; 30-04-15 at 11:38.
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