Need a year of manufacture for an early X1/9

I've just taken delivery of a LHD Fiat X1/9 1300 Series 1 from the Netherlands. In order to register it with DVLA I need to provide them with the year of manufacture. The Chassis no. is 128AS0004957 - an early example. Can anyone help please?

This may help, it ties it down to a year but not the exact date.

x19gr.50webs.com/tecnical.htm

According to that your car was built in 1974.

Year of manufacture is all that's required. Many thanks Pete.

As well as reaching out to the forum I'd contacted the Fiat Register of Italy by email at info@registrofiat.it and they have confirmed that my X1/9 Chassis number 128AS0004957 was in fact an early car manufactured in September 1973. Just wanted to make members aware that the 'Fiat Bertone x1/9 Chassis Serial Numbers Per Year' table on the Greek owner's site (x19gr.50webs.com/tecnical.htm) appears to contain inaccuracies.