Hi Alison,
Yours looks in slightly better condition than mine and has the original wooden roller at the front, whereas mine has the later plastic ones, probably retrofitted; as the wooden ones can split and were generally replaced with plastic ones from the mid 70s on.
As to value; I’m not sure we can put prices etc., on here but, you could get about 5.1/2 litres of petrol for what I paid ! Probably under its value but, a look on that certain auction site shows they don’t fetch that much.
Still a nice little mower that can go on giving sterling service for decades. 🙂