Where on the handle is the part number?
Has a label, refer first attached
I found a page from Silicon Chip with the Ad from when I bought mine
Aargh, wish I'd seen that ad

Mine has a 7 pin connector
So does mine - I think there's an alternative, later model, handpiece called 210ESD, refer attached - perhaps DSE used that ?
On the exterior of the heater barrel after removing the tip retaining sleeve is the engraved letters 8BHA and that is about all I can see.
Mine just has 32V100W embossed on the heater element, visible after taking off the retaining nut, sleeve & soldering tip
Is that $39 just for the heater element or for the handle as a complete unit?
I presume element assembly as distinct from element itself, but won't know until Altronics can supply the part
Element assembly, refer last attached, is removed by undoing three self tapping screws from the front of the handpiece, and a cable locking grub screw from the rear (just to right of label in first pic)
Element itself has four wires going to PCB, at points labelled S+ (black), S- (green), H1 (white) & H2 (red), which I presume are Sensor & Heater respectively - there's also a yellow (Earth ?) wire soldered to the round PCB attached to the element itself