Curious Underfloor Marking?

[Mick Hobday]

During the restoration of my 1932 Four Seat Tourer I found this triangular plate tucked away, spot welded under the transmission tunnel, just about under where the rear seat cushion rests.  There ought to be a reason for it to be there, but what?  Has anyone seen similar plates attached?  I'm wondering if a variety of shapes were used in order to identify the fabricator for quality control or bonus/pay accounting, somewhat  similar to medieval masons' marks.  Any ideas?
   

[Dave Mann]

    I've got two under the rear floor of our RN, one between the diff and spare wheel and one hiding above the torque tube.

[Colin Morgan]

Is there a hole on the other side that this covers?

[Mick Hobday]

Colin, excellent question!  There's a 1/4" hole, now neatly covered by the triangle.  See top view attached.
Dave - my car is one of the first with rear petrol tank, so exactly where your rearward triangle is located I have the large hole provided to access the tank sender unit.
Must dash - I have a few more rivets to count...

[Andrew Fallon]

Super picture Dave!

[Ruairidh Dunford]

Another here too..


  Screenshot 2022-03-25 at 19.56.00.png (Size: 73.34 KB / Downloads: 149)

[Dave Mann]

Thanks, that's jogged my memory, there is a 1/4" hole above the triangle. the hole is for locating the panel for assembly.