Rootes group churchill RG 375 special tool puller. Humber puller.

Rootes group churchill special tool RG375 puller as shown in photos. Not sure what specific task or vehicle it is for!!! Any help appreciated!! Has been in my workshop for many years so having a clearout of things I no longer need or use. Most of these type tools were used for pulling seals or bearings etc. Is in a used condition as you can see in the photos. but still very useable. I would imagine there should be a piece of rod to expand the collets out to grip whatever is being pulled but this is no longer there. this could easily be substituted for by a piece of rod the right size to slide down the centre and open up the collets.
Please study pictures for condition and so you can see exactly what you are buying.
Postage to UK only and PAYPAL only please.
Thanks for looking.
Since listing I have been informed by another kind ebayer that this tool was for use on humber vehicles.