Closed Pentium II 450 Mhz
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sprcorreia
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He doesn't want a Pentium III (3). He wants the 450 Pentium II (2).
Just too many boxes around 
if you look through your boxes,, Keep an eye out for a PII-300 (Deschutes core) with 2.0v(not 2.2v) either SL2W8 or SL2YK
I used to work for a company building PC's back when the cyrix 300 / pentium II was "NEW".
I built a batch of PII-300 PC's for a client (about 30) and out of 30, 20 of them had an error on the bios at boot "error mismatch sync", turns out most of the PII-300 we bought were actually rebadged PII-450 the reason for the error as they wanted to run at 100mhz not 66mhz as I had set in the bios.(Intel had a shortage for about 2 weeks of PII-300 cpus) (as proven by the 2.0v), obviously I bought some of the CPU's from work at cost and passed them on to my friends (I kept one for myself) as the 450 was over £500 when it was released.
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this is most likely one (but not a Costa Rica). but can only prove it if the motherboard "auto" detect the FSB speed as 100mhz
http://www.x86-guide.com/en/cpu/Intel-Pentium-II-300-(0,25µ)-cpu-no1863.html
a little history in trying to identify that factory rebadged PII-300 as a PII-450
http://www.tomshardware.co.uk/overclocking-special,review-93-2.html
I used to work for a company building PC's back when the cyrix 300 / pentium II was "NEW".
I built a batch of PII-300 PC's for a client (about 30) and out of 30, 20 of them had an error on the bios at boot "error mismatch sync", turns out most of the PII-300 we bought were actually rebadged PII-450 the reason for the error as they wanted to run at 100mhz not 66mhz as I had set in the bios.(Intel had a shortage for about 2 weeks of PII-300 cpus) (as proven by the 2.0v), obviously I bought some of the CPU's from work at cost and passed them on to my friends (I kept one for myself) as the 450 was over £500 when it was released.
- - - Updated - - -
this is most likely one (but not a Costa Rica). but can only prove it if the motherboard "auto" detect the FSB speed as 100mhz
http://www.x86-guide.com/en/cpu/Intel-Pentium-II-300-(0,25µ)-cpu-no1863.html
a little history in trying to identify that factory rebadged PII-300 as a PII-450
http://www.tomshardware.co.uk/overclocking-special,review-93-2.html
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Yep, The PIII slot 1 was introduced at 450 Mhz and the PII slot 1 Deschuttes ended with 450 Mhz.
if you look through your boxes,, Keep an eye out for a PII-300 (Deschutes core) with 2.0v(not 2.2v) either SL2W8 or SL2YK
I used to work for a company building PC's back when the cyrix 300 / pentium II was "NEW".
I built a batch of PII-300 PC's for a client (about 30) and out of 30, 20 of them had an error on the bios at boot "error mismatch sync", turns out most of the PII-300 we bought were actually rebadged PII-450 the reason for the error as they wanted to run at 100mhz not 66mhz as I had set in the bios.(Intel had a shortage for about 2 weeks of PII-300 cpus) (as proven by the 2.0v), obviously I bought some of the CPU's from work at cost and passed them on to my friends (I kept one for myself) as the 450 was over £500 when it was released.
- - - Updated - - -
this is most likely one (but not a Costa Rica). but can only prove it if the motherboard "auto" detect the FSB speed as 100mhz
http://www.x86-guide.com/en/cpu/Intel-Pentium-II-300-(0,25µ)-cpu-no1863.html
a little history in trying to identify that factory rebadged PII-300 as a PII-450
http://www.tomshardware.co.uk/overclocking-special,review-93-2.html
didn't they also make 500 Mhz which were clocked back to a mere 300 Mhz?
hmm, that would be a nice CPU to have. Aslong its clocked at 450 Mhz I am fine.
Thanks for looking guys, still searching for it though
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no not a 500, they overclocked the PII-300 (because of the cache speed) up to 504mhz.. but what im talking about above is a genuine 450mhz re-badged as a 300 
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