Great detective work KG, my badge is different and appears to have been built for 27" as 26" would be a very long drop...I will check further to see if forks and rear droputs are chromed? I suppose it could be a year either side? I have a 1934 or 37 Hercules catalogue somewhere ...just put in hercules catalogue and this came out on flikr
http://www.flickr.com/photos/mikegerris ... 2633388334
sorry if links not allowed...the 1953 version did have 27" wheels and the correct headbadge, when it changed to 27" and had the larger badge though who knows? anyway thanks for the idea KG...case solved...however I reckon it's 22 1/2" or 23" so will be too big for me dammit!!! though I have just got an Armstrong Moth? in 22" that should
be on 26" so should be ok???hopefully...fingers crossed.