It seems likely, but I haven't been able to find anything like
an MCR number.  On

http://support.neccsdeast.com/Hardware/Notebook/MobilePro/MobilePro750/mp750ovw.asp

the model number is listed as S1424-04A

On Thu, 9 Dec 1999, Jun Ebihara wrote:

> Date: Thu, 09 Dec 1999 11:44:08 +0900
> From: Jun Ebihara <jun@soum.co.jp>
> To: castor@geocast.com
> Cc: port-hpcmips@netbsd.org
> Subject: Re: keymap for NEC MobilePro 750c
> 
> Is NEC MobilePro 750c == MCR_500A?
> Somewhere in your machine,name plate,and Serial number plate,
> is there MCR-500A strings on MobilePro 750c?
> --
> jun ebihara
> 
>