Vincent Bach Periods
		Mouthpieces	Start-up	Manufacturer	Incorporated	Trumpet Maker	Bronx Period 1	Bronx Period 2
	Years	1916-1918	1918-1919	1919-1922	1922-1924	1924-1928	1928-1933	1933-1945
	Location		11 E.14th NYNY	204 E85th NYNY	237 E41st NYNY	237 E41st NYNY	621 E216th Bronx, NY	621 E216th Bronx, NY
					Bach #9 courtesy of Roy Hempley	1928 NY 6 courtesy of Dillon Music	1930 NY 7 courtesy of Dillon Music	1945 courtesy of Dillon Music
	1st serial				N/A	2	apx. 900	apx. 2000
	Wrap				2-over,2-under	2-over,2-under	2-over,2-under	Became taller (valves)
	Slide shape				Besson D radius	Besson D radius	Besson D radius	Besson D radius
	Receiver				unclear	unclear	Long	Long, mid post-war
	Valves				Blessing/own	Blessing/own	Types A-E1	E2, some mixed.
	Valve casings				Blessing/own	Blessing/own	2-piece	2-piece
	Body wall				unclear	unclear	unclear	unclear
	L bore wall				unclear	unclear	unclear	unclear
	Lightweight opt?				unclear	unclear	Yes	Yes
	Reversed opt.?				No	No	No	No
	Bell std. stock				unclear	variable	0.018"-0.023"	0.018"-0.023"
	Bell light stock				unclear	unclear	0.016"-0.018"	0.016"-0.018"
	Bell ultra light				unclear	unclear	0.014"-0.017"	None indicated
	Bell heavy stock				unclear	unclear	unclear	None indicated
	French opt?				Goal???	Yes	Yes	None indicated
	Bell fabrication				1pc, hammer/spin	1pc, hammer/spin	1pc, hammer/spin	1pc, hammer/spin
	Dominant bells				purchased??	T,4,7	6,7,10	7,7-10 (25), 38
	Rim bead wire				unclear	variable	variable / brass wire	brass wire
	Tuning braces				1	1	1	1
	Bb/A option				Yes	Yes	doubtful	None indicated
	Pull for A=440				unclear	unclear	1/2"-3/4"	1/2"
		Post-war	Early Mt. Vernon	Mid-Mt.Vernon	Selmer Mt.Vernon	Early Elkhart	Elkhart	Modern Elkhart
	Years	1945-1953	1953-1956	1956-1963	1963-1964	1965-1974	1975-ca. 2000	Present
	Location	621 E216th Bronx, NY	50 S Macquesten, MV, NY	50 S Macquesten, MV, NY	50 S Macquesten, MV, NY	Main St., Elkhart, IN	600 Industrial, Elkhart	600 Industrial, Elkhart
		1950 L-25 courtesy of Dillon Music	1953 37 courtesy of Dillon Music	1962 ML43	1963 180-37	1970 43 courtesy of Dillon Music	1994 72 courtesy of Dillon Music	2009 MLV72G
	1st serial	6000/6500	12615	apx. 16000	apx. 25000	apx. 30000	apx. 100-110,000	apx. 525,000
	Wrap	Taller still	same	Reached final height	same	same	same	same
	Slide shape	flatter D	flatter D	squarish with flat crook	squarish with flat crook	squarish with flat crook	squarish with flat crook	squarish with flat crook
	Receiver	mid	mid	short	short	short	short	became longer 2011
	Valves	E2, some mixed	E2	E2	E2	E2	E2	E2
	Valve casings	2-piece	2-piece	2-piece	2-piece	2-piece	1-piece	1-piece
	Body wall	mix, mostly 0.025"	0.025"	0.025"	0.025"	0.025"	0.025"	0.025"
	L bore wall	0.023"?	0.023"	0.023"	0.023"	0.023"	0.023"	0.023"
	Lightweight opt?	None indicated	None indicated	None indicated	No	Yes	Yes	Yes
	Reversed opt.?	No	No	No	No	unclear	Yes	Yes
	Bell std. stock	0.020"	0.020"	0.020"	0.020"	0.025"	0.025"	0.025"
	Bell light stock	0.016"-0.018"	0.016"-0.018"	0.016"-0.018"	0.016"-0.018"	0.020"	0.020"	0.020"
	Bell ultra light	None indicated	None indicated	None indicated	None indicated	None indicated	N/A	N/A
	Bell heavy stock	None indicated	None indicated	None indicated	None indicated	unclear if 0.030"	0.030"	0.030"
	French opt?	None indicated	Yes - Besson alloy copy	Yes - Besson alloy copy	None indicated	None indicated	unclear	"Chicago"
	Bell fabrication	1pc, hammer/spin	1pc, hammer/spin	1pc, hammer/spin	1pc, hammer/spin	1pc, hammer/spin	1pc, hammer/spin	hydroform/spin
	Dominant bells	25, 37, 38, (42&43)	25, 37, 43	25, 37, 43 (65)	37, 43 (72)	25, 37, 43, 72	25, 37, 43, 72	1b, 25, 37, 43, 72
	Rim bead wire	brass wire	brass wire	brass wire	brass wire	steel wire	steel early then brass	brass wire
	Tuning braces	transition to 2	2	2	2	2	2	2
	Bb/A option	None indicated	None indicated	None indicated	None indicated	None indicated	None indicated	None indicated
	Pull for A=440	1/2"	1/2"	1"	1/2"	1/2"	1/2"	1/2"