FYI - Updated Italian proof House Date Codes Table

[Griz44Mag]

ABBREVIATIONS RELATING TO THE WEAPON TEST YEAR
Note: Before 1954, the test year was indicated with Arabic numerals

Theme song	Year	Theme song	Year	Theme song	Year
X	1954	AE	1979	BU	2004
XI	1955	AF	1980	BZ	2005
XII	1956	AH	1981	CA	2006
XIII	1957	AI	1982	CB	2007
XIV	1958	TO THE	1983	CC	2008
XV	1959	AM	1984	CD	2009
XVI	1960	AN	1985	CF	2010
XVII	1961	AP	1986	CH	2011
XVIII	1962	AS	1987	CI	2012
XIX	1963	AT	1988	CL	2013
XX	1964	AU	1989	CM	2014
XXI	1965	AZ	1990	CN	2015
XXII	1966	BA	1991	CP	2016
XXIII	1967	BB	1992	CS	2017
XXIV	1968	BC	1993	CT	2018
XXV	1969	BD	1994	CU	2019
XXVI	1970	BF	1995	CZ	Until 31/05/2020
XX7	1971	BH	1996	20	From 01/06/2020
XX8	1972	BI	1997	21	2021
XX9	1973	BL	1998
XXX	1974	BM	1999
AA	1975	BN	2000
AB	1976	BP	2001
B.C	1977	BS	2002
TO	1978	BT	2003

 

[Griz44Mag]

And some of the stamps: