Merlin Titanium - why 132.5 dropouts? What's the post?

Anyone know why the rear dropouts are 132.5mm (as per catalogue and near as dammit measured in reality)? So either a 130 or 135 could go in?
I've bought an earlier XT hub so will be getting the rear wheel re-built. Shall I space it to 132.5mm before re-build as I have the opportunity to? The wheel would only be for this frame. I'd have to choose axle length carefully and mock-up to make sure the axle doesn't protrude the dropouts if I chose a '135' axle.

I'd still love to know who made the Ti seatpost so I can eventually state it on the list of build parts. It's 25.4mm. Rusty bolts now replaced with Ti and a new 1992 Vetta Lite fitted.

Cheers

IMG_1179.JPG
 
Perhaps an IRD or Syncros seatpost?
Here's what the re-pros look like for comparison:
 
Perhaps an IRD or Syncros seatpost?
Here's what the re-pros look like for comparison:
Yes, similar, but not quite from what I can find pics of! The upper collar on mine is 'proud' - looks like a U.S.E one (but with a collar), and is not 25.0 so I don't think it's a U.S.E one...someone'll come along and 100% for sure which'll be great!
 
Dropout spacing allows the use of 130 or 135 rear hubs as you suspected.
Cool, thanks - a 135 came out of it, the (brand) new XT one is currently 130 and so pinches-in the stays a teeny bit. I might as well space it to 132.5 as it's a one-off - it'll be a chance to put new grease in - even though Shimano grease seems to last decades.
Cheers
 
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