Jan,
Here or two of the ten ".PRD" files available.  None of the 10 had you model 
numbers.  I suspect however that you may need to get a copy of the user manual.

;Okidata9.prd     Okidata
;Pacemark-3410
;Microline-380
;Micriline-390+
;Microline-391+
;Microline-393+
;Microline-393C+
#Draft <27 120 0>
#Letter_quality <27 120 1>
#Italics <27 52>
#Bold <27 71>
#Compressed <15>
#Underline <27 45 1>
#Superscript <27 83 0>
#Subscript <27 83 1>
#Double_wide <27 87 1>
#Italics_off <27 53>
#Bold_off <27 72>
#Compressed_off <18>
#Underline_off <27 45 0>
#Superscript_off <27 84>
#Subscript_off <27 84>
#Double_wide_off <27 87 0>
#Default_font1 <27 116 48>
#Line_font2 <27 116 49>
#Pitch10 <27 80>
#Pitch12 <27 77>
#Proportional <27 112 1>
#Reset <27 64>
#Proportional_off <27 112 0>
;Okidat10.prd                 Okidata
;OL400
;OL800
;OL820
#Italics <27 40 115 49 83>
#Bold <27 40 115 51 66>
#Compressed <27 40 115 49 54 46 54 54 72>
#Underline <27 38 100 48 68>
#Superscript <27 38 97 45 54 48 86>
#Subscript <27 38 97 43 54 48 86>
#Double_wide
#Italics_off <27 40 115 48 83>
#Bold_off <27 40 115 48 66>
#Compressed_off <27 40 115 49 48 72>
#Underline_off <27 38 100 64>
#Superscript_off <27 38 97 43 54 48 86>
#Subscript_off <27 38 97 45 54 48 86>
#Double_wide_off
#Default_Font1 <27 40 56 85>
#Line_Font2 <27 40 49 48 85>
#Pitch10 <27 40 115 49 48 72>
#Pitch12 <27 40 115 49 50 72>
#Proportional <27 40 115 49 80>
#Landscape <27 38 108 49 79>
#Portrait <27 38 108 48 79>
#Reset <27 69>

A google search found the following info:
Okidata MICROLINE 421 Printer Features:
Technology:     Dot Matrix 9-pin SIDM Impact Printing
Max. Graphic Resolution:        240 dpi(H) x 216 dpi(V)
Speeds:         Letter: 95 cps, Utility: 380 cps, Hi-Speed: 510 cps, Draft 
Utility: 570 cps
Characters Per Inch:    Letter: 10 cpi, Utility: 10 cpi, Hi-Speed: 10 cpi, 
Draft Utility: 12 cpi
Feed Rate:      4.5 Inchs Per Second (11.4 cm/sec.)
Carriage Width:         Min.: 3 Inches Wide / Max.: 14.7 Inches Wide
Paper Type:     Single/Multiple Part, Continuous Forms, Cut Sheet, Index, 
Envelopes and Labels
Copies / Thickness:     Up to 6 Part Forms / Up to 0.017" Maximum Thickness
Paper Feeding:  Rear Push and Friction Feed
Optional Feeding:       Bottom Push Tractor, Top Pull Tractor, Cut Sheet Feeder 
and Roll Paper Stand
Emulations:     Epson LQ, IBM ProPrinter and OKI MICROLINE
Emulations
Emulations      Epson® FX, IBM® ProPrinter®, OKI MICROLINE
Compatibility
OS Compatibility        Windows® XP, 2000, 98/95, 3.x and NT® 4.0; MS-DOS® 

Note the CPI option.  I think you would be safe using a COURIER font.

If you have additional questions I would be happy to try to answer them. 
Jim Bentley
American Celiac Society
[EMAIL PROTECTED]
tel: 1-504-737-3293


--- On Tue, 6/24/08, jan johansen <[EMAIL PROTECTED]> wrote:

> From: jan johansen <[EMAIL PROTECTED]>
> Subject: [RBASE-L] - Re: Dot Matrix
> To: "RBASE-L Mailing List" <[email protected]>
> Date: Tuesday, June 24, 2008, 4:24 PM
> James,
> 
> They are
> OKI Microline 420
> OKI Microline 421
> OKI Microline 520
> 
> Thanks.
> 
> Jan





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