Thanks, I think the comments above the frame clearance and stays are a better indication of the model. The pierced lugs seem to be common, but could well have gone across a number of models. My understanding of the numbers is that the first two digits are a year code and the rest are sequential build numbers in that year so they are only batching by year and not model.
That said the typical number quoted is ~125 frames per year for the shop. We have found numbers higher than that so it could be in the region of 150/yr. In addition we have found more frame numbers for 1969 than the other years, hence Dougs comments above. We have no documentary evidence for the 69 frame number being used in the following years, just the high number and then lack of numbers until 1974, which seem to follow on from the number seen for 1969. In addition to this some of the models listed in catalogs for early 70's have 69 numbers. The number for 1975 all seem to be badged as Roy Thames and he then used his own numbers from 1976 when Holdsworth went to the 6D factory numbers.
I think your frame is clearly from 1974, it may not have been sold until the following which is not uncommon, but the number indicates 74 build. I thin the fender eyes are a good indication of the model.