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Bausch & Lomb binoculars did carry a Limited Life Time Warranty. I quote the first paragraph of the enclosed warranty card. The rest of the card just mentions the address to send them. The card is old and always good to check for the current address. "Your Bushnell or Bausch & Lomb binocular, riflescope, or telescope is unquestionably warranted to be free of defect in material and workmanship for the lifetime of the original owner." Coating wearing off is not considered a warranty repair as coatings can come off over time. Rubbing too hard often or not blowing off debris before cleaning can do this. Using cleaners not made for coated lenses also can. The Bausch & Lomb Discoverer was made by Bushnell. They have owned B & L's binoculars business since the mid seventies. Bushnell still make the discoverer line under the Bushnell brand name. Contact Bushnell in your country for service.
The model of Steiner binoculars is on the plastic plates on the body. On earlier models mainly the green rubber covered military types is is molded at the front of the body near the objective lenses. These were called the Military/Marine and are of a different specification to the current Military/Marine. The original were a military bincocular which has more in common with the current Steiner Military. If you are after the serial number it is located on the front metal disc between the binocular barrels on a porro prism binocular. A porro is where the objective lenses are spaced further apart than the eyepieces. On a roof prism Steiner the serial number is located underneath between the two barrels on the hinge. Roof prisms are binoculars where the objective and the eyepieces are in line. If the serial number is a 10 digit number the 1st and 3rd numbers will give you the year of manufacture.
EG: 9042577777= 1994
If it is five or six digit number then it is the 1st and 2nd numbers
EG: 871245= 1987
Bausch & Lomb was purchased by Bushnell in the 70's. Your elites are Japanese made and considered quite a good binocular. Bushnell continued to make the same binoculars bearing the Elite name but replaced B&L with Bushnell. The current elites are different shaped. You could contact Bushnell or you could go to a store in your area that may stock the older Bushnell Elites and try and see if the eyecups fit.
On the whole, I'd advise against dismantling binoculars yourself. Unlike most other optical devices, alignement is really important because you need to feed the same image into both eyes. If you're going to end up paying someone to realign the instrument, you might as well get them to do the cleaning at the same time.