G'day Sean and Mf,

148074 model 3

279514 Victa 18 Special 2nd series of alloy base (not the 4 bolt base which is the 1 st series )
277530
217003

AC 28806 I've seen these on the last Victa 18 Special base with no edger slot and the 3rd base that's missing the mounts for flaps
AC 46769 .
1076 IAAA

181266 Victa 18 Special 4 bolt base, 1st series alloy base ,has no bolts in side skirt mounting holes.Plastic Victa Special badge.

162496 In my opinion this was kind of the first Special but with alloy Auto badge ,has all auto parts except front and rear flaps and has manual throttle lever.
I think these were built as an Auto but Victa may have recalled them and removed flaps or Victa sold them as a special but used up the auto parts on this model.

2BAB27730 not sure on that one ,I know 2BAD is model 8 .

Cheers
Max.