We are starting to get into history of New Holland balers
Lords of shadow 3. The list I had was from Messick's parts book. They probably don't carry parts for the balers built in the forties.

Nolt Baler Saves New Holland New Holland needed a product that could increase sales. It was already in the shop in the form of the Nolt baler. New Holland acquired the rights to build the baler in 1940 and production started later that year. The self­ tie baler was no doubt the turning point in New Holland's history. In 1941 New Holland built 351 balers.
Even as early as 1940, United States defense industries were beginning to require enormous quantities of materials that were becoming increasingly scarce. Because the 73 baler required so little manpower, New Holland was able to get a special allocation of steel to build balers during World War II. In 1943 New Holland built 632 Model 75 balers, followed by over 2,000 balers in 1944. Baler production soared to 4,700 Model 76 balers in 1946 and the plant was tooling up to build nearly three times that many in 1948.
Diversified Product Line By 1946 New Holland products included tractor saws, saw frames, husker-shellers, limestone pulverizers, roll crushers, jaw crushers, hammer crushers, belting, general purpose and cement mixers, and power units, as well as shellers and hammermills. Eventually the company also offered rotary tillers and potato harvesters. With the company's near-term future assured by the outstanding success of the baler, New Holland engineers could spread their wings with some new concepts. One was the Sizz-Weeder, a flame cultivator that not only cooked weeds in cotton fields but also broiled the cotton boll-weevil. The concept worked all right in the hands of a careful operator, but inexperienced operators soon began torching entire cotton fields — so much for flame cultivation.
Sperry Corporation Brings Growth and Expansion New Holland's success attracted the attention of the Sperry Corporation which acquired New Holland in 1947. Everybody won — New Holland obtained a new source of capital and Sperry diversified its high-tech holdings. In 1973 the company became known as Sperr New Holland.
The Dellinger Company of Lancaster, Pennsylvania, made a successful ensilage cutter. New Holland acquired Dellinger in 1948 and used the ensilage cutter as the basis for the Model 600 field forage harvester. Factories in Mountville, Belleville, and Lancaster, Pennsylvania, were opened. The Belleville plant began producing side-delivery rakes in 1948. The Model 700 manure spreader appeared in late 1949. New Holland manufactured over 42,000 balers in ten short years. In just over a quarter­ century President Delp and his co-workers nurtured New Holland from a nearly unknown company to a spot in the top ten farm equipment manufacturers.

505) NH SQUARE BALER (1/84-3/91) (326) NH SQUARE BALER (7/85-7/88) (575) NH SQUARE BALER (7/88-8/08) (565) NH SQUARE BALER (7/89-8/08) (570) NH SQUARE BALER (1/89-8/08) (568) NH SMALL SQUARE BALER (8/91-12/95) (580) NH SQUARE BALER (2/92-8/08) (515) NH SQUARE BALER (1/92-1/96) (585) NH 3-TIE IN-LINE SQUARE BALER (1/97-4/99) (BB900) NH 3-TIE INLINE SQUARE BALER (10/00-12/04) (BC5050) SMALL SQUARE BALER (9/08-) (BC5060) SMALL SQUARE BALER - 2008 (9/08-) (BC5070) SMALL SQUARE BALER - 2008 (9/08-) (BC5070) HAYLINER SMALL SQUARE BALER (9/09-12/09) (BC5080) SMALL SQUARE BALER (9/08-)

A Century of Ford and New Holland Farm Equipment by Norm Swinford

Lots of history and a very nice listing of balers by model number with many specifications (this is on pages 206 and 207)

Loop chess. The book is available from ASAE of St Joseph, MI www.asae.org

https://www.tractorhouse.com/listings/farm-equipment/for-sale/category/1136/hay-and-forage-equipment-square-balers/manufacturer/new-holland

Sorry I thought this would show up high-lighted.