For a while I've been wondering why some WS planes are (for example) "No. 4" while others are "No. A4"?
Possibly one is an earlier designation than the other. But I've been looking at WS planes that come up on internet sites, as well as my own, and there are two distinct lever cap styles
"Type 1" - chunky with crude "WS"
and "type 2" - curvey with more refined raised "WS" (lower plane)
And there seems to be a tendancy for the more refined lever-cap to be on the "A" planes, as the photo above (the "A7") and those that follow show
A4 & A5, both with "type 2" lever caps and "No. A5" visible on one casting.
here's the above No.4 with "No. A4" cast
behind the knob.
and another with the "No. A4" in
front of the knob.
Then the basic "type 1" lever caps on "No. 4" (non A4) planes
actually this seems to be a transitional lever cap, with the sweeping curves of the "type 2" but the lettering of the "type 1".
Then, just to throw my theory out the window, there's this
I'm sure there's a tiny "A" in front of the "4" on that box :evil:
Cheers, Vann.
My thanks to those whose photos I've half-inched