Prior to the 21st century and the computer age; design models were synonymous with the term "builder's model." From the beginning of time up thru the 1800's ships, warships and otherwise (which were primarily built from wood) were constructed WITHOUT paper plans (sometimes referred to as "blueprints"). The ship builders just started building the vessel until it was completed; without plans no ship would ever be exactly like the next one. As Kings and Queens (nation's leaders) requested more vessels to be built, they wanted to know what they would look like when finished, and if it were to meet their needs: consequently, the ship builders constructed a MODEL (also made of wood) of the vessel to be built; the King or Queen (or nation's leader) would inspect/view the model, which might be anywhere from 2 to 6 feet in length and say whether or not they liked what they saw. This was the called the BUILDER's MODEL (model ship). From there, the actual vessel would be constructed, and the model ship (builder's model) would be donated to a museum or the office of the new owner, or someone that wanted it.
From the 1800s to present, model ships have become popular hobbies for people, for people all around the world, not just the United States, Great Britain, Spain, or France (these nations built alot of model ships in their times). Another words, what started out as a necessity...developed into a hobby (model ship building).
21st century computers have rendered BUILDER's MODELs obsolete; they are no longer necessary to construct anything (ships, planes, cars, etc.). However, people still like them, and the US Navy, Army, Marine Corps, or Air Force, or private companies such as airline companies may still want them, or would like to have them just to maintain TRADITION.
Model designation, Model "A", Model "T", Model "B".
Designation for different products
S&W has not used 19a as a model designation.
Stem EX? If you are asking what does the model designation EX mean, it is just a designation Honda gives to their upscale vehicles.
If you are seeing the Model 65 designation on the barrel, but the Model 1892 designation on the rear tang behind the hammer, what you have is a Model 1892 that has been rebarrelled with a Model 65 barrel. Not an uncommon conversion years ago, but tragic from a collector's standpoint. sales@countrygunsmith.net
It means it has 2 turbos.
I believe that is a 4R70W
Model designation
Stem EX? If you are asking what does the model designation EX mean, it is just a designation Honda gives to their upscale vehicles.
The Softail Deluxe was introduced in the summer of 2004 as a 2005 model. Its model designation, FLSTN, is the same designation as for the Softail Nostalgia, originally introduced as a 1993 model (hence the "N" at the end).
The Model 62 was produced from 1932 to c.1938, when the model designation was changed to 62A.
The model that replaced the Model T in the Ford lineup was the Model A. Ford started over with the alphabet designation because he said the Model A was such a departure from the Model T that he felt it was like starting over. There was no Model U.