B1 - 61161

[65179]

Mmmm. Four, I think, Simon.
The preserved 1264, that I based my speedo mounting design on, uses 4 slot headed countersunk screws that are flush with the outside face of the valence. I thought wouldn't really show on a 4 mm scale model, so didn't bother. However, checking photos of loco in service, in the Yeadon book, seem to show snap head fixings, which definitely do show. Have you any decent , side-on, photos or drawing showing the attachment arrangements?
Just goes to show the dangers of using preserved locos for information.
Dave.

I was going off this image I posted before:

Post in thread 'B1 - 61161' B1 - 61161

but now you mention it the last rivet is probably in shadow.

Simon

 

[65179]

 

[65179]

There's also this Old Ganian Flickr image:

https://flic.kr/p/TtpC5E

It was only a joke, it's quite questionable whether adding them is worth it!

Simon