many of the older Yales had the s/n stamped on the front frame cowl in between the tilt cylinders
looks like an old GDP25EB to me lads.replace the inching valve seals when you do the master cylinder or it,ll drive you mad.you should find a serial number stamped on the main chassis some place. can,t quite mind where though ,i remember they used to show up when you strip back the paint work
would u give me a clear picture then i'll refer to our Q/A Dept.
Can you send a bigger pic to my e mail?