The trusty ole Dx lever worked "upside down" when conbined with a set of MX100 Brakes BITD.
Supply for gen_u_wine Dx levers in the early 80's here in Oz was that you bought whatever colour u wanted , then fit it to whatever side you needed to fit , regardless of what way the Dx symbol was facing
I wish you well & good hunting in finding the "correct" genuine (NOS?)Shimano Dx lever your after.....
JB
BTW
What/how are the early Dx levers coated with ? <heh>
Had a TON of fun with the coating method on 1st issue DX pedals a while back in here....