Attached are the ROMs from an early prototype Lisa 1 I got to work on over the weekend. For easier reading, I've additionally combined the 2 system ROMs into one file.
The System ROMs are marked 2.09 in pen, and do not display a version number on the screen when booting up.
The system doesn't have a serial number sticker.
Awesome! I checked against files on bitsavers, and by comparing hashes it would appear that the boot ROMs are version B ROMs: "(very rare) - development only?" according to this file (http://bitsavers.org/bits/Apple/Lisa/firmware/Firmware_Revisions.txt).
9a585bbab4826079710f4e1b85730f2230c383bfac19f612a5702d83a5f72d3f 341-0176-B.BIN <--- Bitsavers file
9a585bbab4826079710f4e1b85730f2230c383bfac19f612a5702d83a5f72d3f proto_Lisa1_20.9_L.bin
a0059fe1fbbd2963139840c7b9e5a5fc4f9f6bc7c9dab8fbeae911c67feb34f7 341-0175-B.BIN <--- Bitsavers file
a0059fe1fbbd2963139840c7b9e5a5fc4f9f6bc7c9dab8fbeae911c67feb34f7 proto_Lisa1_20.9_H.bin
The 341-0138-BT-D.bin file matches no other file on Bitsavers, meanwhile.
The comments at the top of the version H boot ROM source code (http://bitsavers.org/pdf/apple/lisa/firmware/Lisa_Boot_ROM_Asm_Listing.TEXT) shows what changes came before and after version 2.09. It looks like showing the ROM version on startup came six months after the 2.09 release, among other useful changes and bug fixes.