↑↑↑ What Old Farang said. 
Depending on the model, the price may fluctuate a bit. There should be a small plate on the side, below the Vertical Tangent, clamp screw, with an alpha-numeric model i.e. T1A (Unlikely), T21, T16 etc. It may also be an RDS model.
Does it have a Tribrach? The three-knobbed, triangular, levelling plate on the very bottom?
I'm good mates with the retired creator/curator of the Qld Surveying Museum so, if you want, if you can get the model number, he may be able to advise or even be interested in it.
Of course, Old Farang has dibs on it, for sure!
p.s. being a '61 model, it could also be a Kern brand. Also an excellent, Swiss made instrument.
				
			 
			
		 
			
				
			
			
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