Just heard from John Hall regarding this bass and he confirms it was not a RoMo 1999. It is more likely a domestically produced 4001S that has somehow made its way over the years to Ireland.
"Five and only five instruments (one of which was a bass) were shipped to Rose Morris, all bearing serial numbers prefixed DA. None of them were DA09 or DA23. This shipment was a sample for their consideration and photography, made in early 1964. (Their original order of 11/22/63 was for seven instruments but they then cancelled the Model 315 and 625 prior to shipment.)
The first actual shipment for stock was in May 1964 and the first bass (with the lowest serial number) had a prefix of DC.
We have full hard copy documentation of all of the Rose Morris instruments."
So not a Rose Morris 1999 bass. And the earliest authentic RoMo 1999 models start with DC - Earlier ones were all produced for sale in the US
The picture of the jackplate answered my question - so thanks Donald! A real 1964 jackplate has the SN on just one line at the bottom - just like the picture shows. Also as I guessed you mistakenly added an extra 0. DA09 is the correct SN.
Nice bass. I hope you get it restored. if it is just being restored in order to sell it - you will almost certainly find a collector here willing to take it off your hands as is.
I wish you much success with it...
