The cane is rather modern... bulkier than previous generations. I would guess that type of unit would not have gone into production until the 1990's. If you are looking for a smaller crane located behind the cab, check out some of the Tomytec trucks out there. Several have such a crane attachment.
I really want a bulk pack of this cab and chassis. These would be useful for everything from moving service trucks to landscapers and especially fire engines. Plop a Athearn KME pumper tank on top of the single axle crew cab and you have a pretty realistic commercial chassis pumper.