These don’t look like true P. Altum to me. All the P. Altum I have seen have had the full baring even when young. Another defining feature of P. Altum is that they have faint bars between the prominent 3 and the space between the bars (the silver part of that makes sense) will not be thicker then the bars themselves.I found these at the LFS and told me they are altums. But am not sure and the bars seems missing.
can any one help to ID
thanksView attachment 1428468