Currently Manufactured RPN Calculators

[tuxfish]

Compucessory 28956, all HP-12C Platinum models (prob. HP-12C Prestige, too)
can be switched between ALG & RPN mode.

These models remember the mode they have been in when turned off
and will start in the same mode when turned on again.
Therefore - IMHO - a default RPN-mode does not play such
an important role as one might think at first glance.

The HP-12c models including the 30th Anniversary Edition,
the Aurora FN1000 and the SwissMicros DM-1x are RPN-only.

Further RPN-calculators still built today: SwissMicros DM-42

Honorably mentioned: WP 34s

Non-HP RPN-calculators of the past:
Omron SR12, Privileg SR-54NC, Elektronika MK-61 ...