[GreenKeys] Unusual telegraph device

[Sam Hallas]

A correspondent, Peter Prest <peterhprest at btinternet.com> has sent me 
pictures and description of a device he's had for some 20 years.

Most curious. Has a typewriter style keyboard. His description follows. 
Here are his pictures.

<https://photos.app.goo.gl/Zk79IL73ThllpWZa2>

Any ideas what it might do?

Sam

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LIGHTWEIGHT TELEWRITER File: Lightweight Telewriter Notes.odt
Notes:
Weighs just over 20lb the lightweight name suggests a military portable use.

Designed to be powered from a 12v accumulator, but with provision for 
output to have extra cells
added, presumably to overcome volts drops due to long lines.

Originally thought to have a paper tape punch but this is not so.

Output labelled printer on circuit diagram but no ink system or punches.

Uses standard width teleprinter paper which is moistened from a small 
water container and wick.

A picker rotates and has 5 small springs with points on the end.

General construction suggests United Kingdom late 1930s military 
telegraph application.

No makers name or reference number !

Fuseholder made by Belling & Lee and has a 10H/ military stores number. 
The fuse is probably original :
1A 648 ZA3576 ZC0039 10H/9613 BS646

10H/9613 can be found in military stores records I have not found a date 
for BS646 but BS546 was specified in April 1934 so this agrees with late 
30s onwards.

The Relay cover is embossed AN and the relay looks like a PO 3000, it 
has numbers 4671 ACF
W43.1 and is single pole normally open.

The buzzer is 12v and has a removable bakelite cover – no makers name.

Panel lettering is engraved and filled.

Numbers on twin solenoids ST.39262 A 580 ohms symbol

The keyboard cover is a complicated bakelite moulding so would have had 
expensive tooling, suggesting that a significant number of units was 
planned.
The lettering on the keys suggests 1930s.
The circuit diagram and instructions are printed on aluminium panels 
held on by small nuts and bolts.

The mechanism is quite complex with lots of specially made components.
Cannot find any reference or photo after extensive internet searches.
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