Help - Irish research

[Margaret in Burton]

I am researching another branch of my son in laws family. His grandfather William Thomas Dyer was apparently born in Ireland.

All parties are deceased.

He married in Burton on Trent. I've checked the marriage out at the library this morning and have this:

January 5th 1952 at St John the Divine, Horninglow, Burton on Trent.

William Thomas Dyer aged 26 a bachelor and an engineer.
Address 10 Harper Avenue, Burton
Father, Arthur Dyer a labourer

Eileen Betty Salt aged 20 and a spinster. Father Charles Edward Salt . I have done the Salt line and it's the Dyer line I want to research.

Witnesses David Havilland Roberts and Charles Edward Salt.


William Thomas Dyer died in Derby in October 1994. His date of birth is listed as 3 June 1924.
Register Number: F1C
District and Subdistrict: 3941F
Entry Number: 109

This age slightly differs from the age at marriage.

The family knew him to be Irish.

There is a birth registration for a William Thomas Dyer in the Irish Civil Registration index for June qtr 1924 vol 2 - page 365 Dublin North

Do the Irish indexes use the first month for the registration instead of the last month of the quarter as England and Wales do?

Where do I go from here. I want to avoid having to send for the birth cert if possible.