Yes, it is possible to purchase authentic samurai swords, commonly known as "katana." However, it's essential to exercise caution and conduct thorough research to ensure that you are buying from a reputable and knowledgeable source. Authentic samurai swords are considered works of art and have historical and cultural significance, so it's important to understand the market and make informed decisions.

Here are a few important points to consider when purchasing an authentic samurai sword:

1. Certification and authenticity: Look for swords that come with proper certification or documentation of authenticity. These documents should provide information about the sword's origins, age, and any historical significance. Certification from reputable organizations or experts in Japanese sword appraisal adds credibility to the sword's authenticity.
2. Reputation and expertise of the seller: Buy from reputable sellers who specialize in authentic samurai swords. Research the seller's background, reviews, and any credentials they may have. Established dealers who are knowledgeable about swords and can provide accurate information are preferable.
3. Legal considerations: Ensure that you comply with local laws and regulations regarding the ownership, import, or sale of samurai swords. Different countries and regions may have specific laws governing the possession and trade of such weapons.
4. Condition and quality: Assess the condition of the sword and the quality of its craftsmanship. Look for signs of quality construction, such as a well-forged blade, proper fittings, and attention to detail. Understand that antique swords may show signs of age and wear, but the overall condition should be evaluated.
5. Price range: Authentic samurai swords, especially those with historical significance, craftsmanship, or belonging to renowned swordsmiths, can be expensive. Be prepared to invest a significant amount of money for an authentic and valuable sword.

It's crucial to note that if you're not knowledgeable about samurai swords, it is advisable to consult with experts or reputable dealers to guide you through the purchasing process. They can help you evaluate the sword's authenticity, quality, and value, ensuring that you make an informed decision.