My Holloway made Leech with Holloway serial number H6275 was built in 1908 so I would imagine yours was built between that date and the date of the catalog, which is 1925, if memory serves. If you email Chris Holloway - custodian of the G&S Holloway records: email tipton.harrier@yahoo.co.uk he should be able to send you pictures of the corresponding Holloway ledger entries.