It would be taken about 1969-1970, Dave. The main differences between it and your preserved version is that they never carried the lettering "Fire Tender" on the sides, though some (if not all) did in time gain the "Emergency Tender" legend when they assumed that role. Note also that the blue beacon was always installed on the off-side.
Added by Ian Moore on 07 January 2011.
On second thoughts, it might have been taken a little later than I said in my last - probably about 1972.
Added by Ian Moore on 07 January 2011.
The blue beacon is now on the correct side Ian, but is a modern plastic type, soon to be replaced by the old domed glass type.
Yes, those old "acorn" type lights as they became nicknamed look prety poor now, but when they first came out they were considered fantastic after just forward-facing amber flashers !
Not many people realise that the use of blue lights on emergency vehicles originated in Germany during the 1930s, when the National Socialist government of Adolf Hitler decided to standardise on what had previously been a police- only light. Now it is becoming common even in North America!
Added by Dave Merrin on 06 January 2011.