It is in used but working condition.
Vintage Smoothflow Power Unit - Mini Models Ltd
Vintage Smoothflow Power Unit Minimodel LTD 12V DC 2.5A Made in England
17volt DC power supply. Smoothflow Power Unit, Tested And Working
MINIMODELS Ltd `SMOOTHFLOW` "POWER UNIT" PLAYWORN
Vintage Triang Power Unit/Transformer/Speed Controller bundle (Mecanno/Hornby)
Vintage TRIANG Power Unit No1 Transformer Model Train Set
