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Every so often, one of these so-called prototype SF chassis/suspension units crops up on Ebay. (I think Graham had a number of them which he actioned off piecemeal.)
Does any Member have any firm information regarding their origins?

I saw that one and thought about bidding but didn’t get round to it. It had the number 23 on it, which I presume means it’s from a VW Dormobile. I’d like to know more too.

The only visiual evidence to it being prototype status is the fact it has un-foiled smooth faced wheels with the axle-ends NOT recessed into the wheel to prevent snagging your fingers.

I would guess the wheels do not have any proper machine made tooling numbers or letters but might have them inscribed by hand.

DrJeep wrote:It had the number 23 on it, which I presume means it’s from a VW Dormobile.

That rings a bell. I think at least some of the others had that too.

GHOSTHUNTER wrote:The only visiual evidence to it being prototype status is the fact it has un-foiled smooth faced wheels with the axle-ends NOT recessed into the wheel to prevent snagging your fingers.

I think the axles are of a greater diameter too, closer to a regular wheel size. Or is that an optical illusion?

DrJeep wrote:

GHOSTHUNTER wrote:The only visiual evidence to it being prototype status is the fact it has un-foiled smooth faced wheels with the axle-ends NOT recessed into the wheel to prevent snagging your fingers.

I think the axles are of a greater diameter too, closer to a regular wheel size. Or is that an optical illusion?

I see what you mean. They certainly look thicker.

Notes supplied with this patent suggest the axles are...''about 25/1000 (0.635 millimetre) diameter''. This would be for full production models, not for the prototype!

I found a few of these at a flee market not far from Rochford along with some complete but unassembled model A's an unassembled Honda bike and several YY bodies and parts
The wheels are not like any other sf the closest being the seafire wheels
The unit is identical to the ones used in the #23 vw camper
The one Graham sold was one of the ones I found Tim and I also sold some on a couple of Facebook sites we frequent
It's possible Tim still has one and I'm sure I kept one back for myself
The price realised by Graham was unrealistic and the buyer did regret it from what Graham told me
If I can find it I will post some close up pictures later

I did a bit of Googling this afternoon and found the photographs below on this page. This appears to be a model maker's resin prototype and uses the same chassis design. Was this style of unit perhaps originally proposed as a standardised component for fitting to various models across the range?

fixer wrote:If I can find it I will post some close up pictures later

If you could also give us an idea of the axle diameter, that would be great.